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Mf Elf / Gutbrod Pto Driven Trailer


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#61 Gav694 OFFLINE  

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Posted December 15, 2013 - 06:30 PM

  :rolling:



#62 DH1 OFFLINE  

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Posted December 15, 2013 - 07:20 PM

11-1/2 revs on the tractor and 10 revs on the trailer is 1-1/2 revs difference, that's not that much, 10% - 15%.

 

The tractor is always going to be pulling the trailer and the trailer will be dragging as it wants to go slower than the tractor does.

If the tractor looses traction, spins it's wheels then the trailer is going to try to push the tractor so that they both go forward.

 

They might of designed this set up that way, if the trailer always wants to go faster than the tractor, the tractor is going to get pushed around.

 

If you increase the Trailer tire pressure, increase the circumference, and decrease the Tractor tire pressure for the opposite effect, the difference will be less.

 

My 2 cents worth.


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#63 motobreeder OFFLINE  

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Posted December 15, 2013 - 11:56 PM

Didn't have time to stop for the PTO adapter, had to get back in time for work  :(

The tyres are 7-12 that are on which are no use which is a shame as they are in real good condition, I need to swap them for 6-12's to match the tractor so they turn at the same speed.

 

Long ago you mentioned that the trailer had 7-12 wheels.  Maybe the gearing is set for the larger diameter wheels?

 

May be worthwhile getting both axles in the air and see if things turn the same when they are not spinning the differentials.  Just in case there's something funny going on with the diff output when the tractor is rounding a corner.


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#64 Gav694 OFFLINE  

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Posted December 16, 2013 - 08:02 AM

Long ago you mentioned that the trailer had 7-12 wheels.  Maybe the gearing is set for the larger diameter wheels?

 

May be worthwhile getting both axles in the air and see if things turn the same when they are not spinning the differentials.  Just in case there's something funny going on with the diff output when the tractor is rounding a corner.

The Gutbrod Trailers came in two versions, this one is actually the slightly larger one normally sold with bigger tractors like the 1050 and comes with 7-12 tyres fitted.

The correct one for my Elf and Gutbrod 1030's comes with 6-12 tyres fitted.

I have a parts list for the trailer and it shows the same axle part number for both trailers just with the different tyres and larger bed fitted so in theory it should all be good.

I will try and get both axles off the ground for a retest and see if it makes any difference but as DH1 says maybe its designed like that.

 

If Will can count how many times a wheel turns and I can do basic maths

11.5 turns on the tractor to 10 on the trailer  11.5/10 gives 1.15 to 1

6-12 tyre circumference of 1729mm x 1.15 gives 1988mm

1988mm minus 1729mm gives a difference of 259mm per revolution

 

This seems quite a lot to me and even a 7-12 with a circumference of around 1810mm wouldnt be enough to match, but it does mean I may have wasted £150 on a pair of tyres that I didn't need, Also the trailer bed would still sit level!!!! :wallbanging:


Edited by Gav694, December 16, 2013 - 11:20 AM.


#65 Gav694 OFFLINE  

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Posted December 28, 2013 - 11:17 AM

When the wife told me she needed some hay moved for her horses I thought it was the perfect opportunity to recreate one of the photo's in the Elf Brochure.

It ended up being a bit rushed as the rain spoiled play time 

trailer brochure.jpg Trailer with hay.jpg


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#66 olcowhand ONLINE  

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Posted December 28, 2013 - 12:01 PM

I believe with part time 4WD on vehicles, the gearing is such that the front always pulls slightly faster than the rear to prevent the "tail from wagging the dog".  That's why you have to take a part time 4WD out of 4WD before hitting solid ground, as it will create tension making it awfully hard to take out of gear.  


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#67 Gav694 OFFLINE  

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Posted December 28, 2013 - 12:06 PM

I believe with part time 4WD on vehicles, the gearing is such that the front always pulls slightly faster than the rear to prevent the "tail from wagging the dog".  That's why you have to take a part time 4WD out of 4WD before hitting solid ground, as it will create tension making it awfully hard to take out of gear.  

I think this is most likely true, and I am now happy with the ratio as I have watched the video back again and I don't think the ratio is as bad as Will counted. I only get 10.5 turns on the tractor wheel to 10 on the trailer making it a much closer match.

I will however level the bed up as I think it looks a bit odd leaning back so far.

John



#68 olcowhand ONLINE  

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Posted December 28, 2013 - 12:11 PM

 I will however level the bed up as I think it looks a bit odd leaning back so far.

John

 

Yes, and with that long bed past the axle, gotta be watchful not to put too much load on the back.  Might lift the tractor off the ground!


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#69 Gav694 OFFLINE  

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Posted December 28, 2013 - 12:15 PM

Yes, and with that long bed past the axle, gotta be watchful not to put too much load on the back.  Might lift the tractor off the ground!

That's why the wife sits at the front  :smilewink:


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#70 UncleWillie OFFLINE  

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Posted December 28, 2013 - 12:38 PM

Just showed my wife this thread, She said i need to find an Elf now.


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#71 MH81 ONLINE  

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Posted December 28, 2013 - 12:45 PM

When the wife told me she needed some hay moved for her horses I thought it was the perfect opportunity to recreate one of the photo's in the Elf Brochure.
It ended up being a bit rushed as the rain spoiled play time 
attachicon.giftrailer brochure.jpgattachicon.gifTrailer with hay.jpg


Yeah, but where is the driver with the 60's hair-do?
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#72 olcowhand ONLINE  

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Posted December 28, 2013 - 01:00 PM

Just showed my wife this thread, She said i need to find an Elf now.

 

Man Willie, you haven't gotten an FF yet!  Ya better concentrate on an FF, as it'll be a wee bit easier to find than an ELF!


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#73 Gav694 OFFLINE  

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Posted December 28, 2013 - 01:08 PM

Just showed my wife this thread, She said i need to find an Elf now.

 

 

Man Willie, you haven't gotten an FF yet!  Ya better concentrate on an FF, as it'll be a wee bit easier to find than an ELF!

Not that hard to find at the moment, you would just have the shipping to sort out!  :D

http://kleinanzeigen...1204?ref=search


Edited by Gav694, December 28, 2013 - 06:17 PM.


#74 Gav694 OFFLINE  

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Posted December 28, 2013 - 01:09 PM

Yeah, but where is the driver with the 60's hair-do?

Still looking for my socks and sandals :rolling:


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#75 IamSherwood OFFLINE  

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Posted December 28, 2013 - 06:05 PM

Not that hard to find at the moment, just the shipping to sort out though

http://kleinanzeigen...1204?ref=search

 

Wow, you found another one. When do you go and pick it up? :smilewink:

Price is up there, but it looks in pretty good shape.






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